Crystalline polyglycolic acid wherein a difference between the melting point Tm and the crystallization temperature Tc2 is not lower than 35 C., and a difference between the crystallization temperature Tc1 and the glass transition temperature Tg is not lower than 40 C. A production process of polyglycolic acid modified in crystallinity, comprising applying heat history to crystalline polyglycolic acid at a temperature of not lower than (the melting point Tm of the crystalline polyglycolic acid+38 C.). A polyglycolic acid composition comprising crystalline polyglycolic acid and a heat stabilizer, wherein a difference (T2-T1) between the temperature T2 at 3%-weight loss on heating of the polyglycolic acid composition and the temperature T1 at 3%-weight loss on heating of the crystalline polyglycolic acid is not lower than 5 C.

 
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